Well yes even to me but only up to a point!
My "up to a point" suppositions are that it is not possible to be built on (possibly ever), can be used for any legal crop, keep domestic animals on or just have as a field.
Beyond that is the point of my question. For example, could I put up wooden buildings such as hen house, pig shelter, stables, barn etc all having agricultural purpose? Could I put up a greenhouse, have a duck or fish pond? Could I plant a forest of trees thereby creating woodland - is that different to agricultural land? Is there a difference to growing / rearing things for my personal use as compared to using for business purposes?
As ever, your insight would be much appreciated.